noun
reciprocation
rih-sip-ruh-KAY-shun/rɪˌsɪprəˈkeɪʃn/
The act of responding with a similar action or feeling.
The man's help is reciprocation for the woman's earlier assistance with his box.

Etymology
From a verb meaning 'move back and forth,' reciprocation names an act of returning. The physical pattern of alternation becomes mutual giving, feeling, or acting in response.
In context
the reciprocation rule is that we should be more willing to comply with a request from someone who has previously provided a favour or concession to us.
More examples
- He hopes for reciprocation when he tells her how he feels.
- In reciprocation for their hospitality, we invite them to dinner.
- Their friendship depends on the reciprocation of trust and support.
Forms
reciprocation · reciprocations
reciprocate verb — To return an action or feeling in kind.
reciprocal adjective — Given or felt by both sides.
Similar words
- reciprocity
- Emphasizes an ongoing mutual relationship rather than one response.
- repayment
- Usually means returning money owed, rather than matching feelings.